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Webster’s Online Dictionarywith Multilingual Thesaurus Translation

English Non-English

Princeton University Cognitive Science Laboratory
WordNet® is a large lexical database of English, developed under the direction of George A. Miller. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept.

The Wordsmyth Dictionary-Thesaurus (WDT) is the only Dictionary with a complete, integrated thesaurus.

Webster’s New World College Dictionary & Thesaurus

Bartleby Roget’s II : The New Thesaurus

Conjugate English and French verbs

HyperDic is a hyper-dictionary: a new kind of dictionary, where related words are linked together in a hypertext, so that readers can easily surf on the English language.

A rich lexical toolbox,
this program allows you to search for rhymes and relationships
between words and concepts that might never have occurred to you before.

This Semantic Atlas provides the geometric representation of the meaning of a word in English synonym dictionary

Synonyms Thesaurus with Antonyms & Definitions

Find out what any acronym, abbreviation, or initialism stands for

Chambers 21st Century Dictionary

English grammar and writing

Wikiwords (Beta) - A multilingual open dictionary built by translators